fix build with ICU 75 and ICU 76HEADmaster

ICU 75 requires C++17 so build fails with AX_CXX_COMPILE_STDCXX_11.
To fix, use AX_CXX_COMPILE_STDCXX_17 (from autoconf-archive 2023.02.20)
when ICU 75 or later is detected.

ICU 76 reduces linkage by moving some Requires to Requires.private, so
`icu-i18n` no longer indirectly adds `icu-uc` when linking to shared
libraries. For simplicity, just look for `icu-uc` while handling ICU 75
as it is backwards compatible and doesn't need a separate conditional.

Change-Id: I6a87312391f89c7b79f0066a09f2fc58fd7576d7
Reviewed-on: https://gerrit.libreoffice.org/c/libcdr/+/175709
Tested-by: Michael Stahl <michael.stahl@allotropia.de>
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

0 files changed, 0 insertions, 0 deletions